Revert of IDL: Add support for [Unscopeable] on attributes and methods

Source/bindings/templates/interface_base.cpp

Index: Source/bindings/templates/interface_base.cpp
diff --git a/Source/bindings/templates/interface_base.cpp b/Source/bindings/templates/interface_base.cpp
index c9c4277afa4cf80ec2462351c1b83bd1d99811cc..ea5c732e40872d01d3d2a217d839c10bde592e0b 100644
--- a/Source/bindings/templates/interface_base.cpp
+++ b/Source/bindings/templates/interface_base.cpp
@@ -418,14 +418,6 @@
     {% endfilter %}{# per_context_enabled() #}
     {% endif %}
     {# End special operations #}
-    {% if unscopeables %}
-    v8::Local<v8::Context> context(isolate->GetCurrentContext());
-    v8::Local<v8::Object> unscopeables(v8::Object::New(isolate));
-    {% for name in unscopeables %}
-    unscopeables->ForceSet(context, v8AtomicString(isolate, "{{name}}"), v8::True(isolate)).FromJust();
-    {% endfor %}
-    prototypeTemplate->Set(v8::Symbol::GetUnscopables(isolate), unscopeables);
-    {% endif %}
     {% if has_custom_legacy_call_as_function %}
     functionTemplate->InstanceTemplate()->SetCallAsFunctionHandler({{v8_class}}::legacyCallCustom);
     {% endif %}